Pole-line insulator



May 19, 1925.

A. F. EMMONS POLE LINE INSULATOR Filed Auz. 27, 1920 w @2 M s m v mw E 82 5 r 2 WE-5:

Ill

- sulator; Fig. 6 is a longitudinal Patented May 19, 1925.

UNITED STATES ALBERT F. EMMONS, OF PITTSBURGH, PENNSYLVANIA.

PQLE LINE INSULATOR.

Application filed August 27, 1920. Serial No. 406,312.

To all 107mm it may concern:

Be it known that I, ALBERT F. EMMONS, a citizen of the United States,and resident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Pole-LineInsulators; and I do hereby declare the following to be a full, clear,and exact description thereof.

My invention relates to pole-line insulators and it has for its objectto provide an improved insulator which I term a Look insulator and inwhich the use of the ordinary glass insulators, wood pins, bolts andtie-wires shall be entirely eliminated.

Another object of my invention is to produce an improved pole-lineinsulator which may be constructed either as a separate attachment forordinary pole-line cross-arms or as an integral part of the cross-armitself. In the latter case the entire crossarm is made of suitableinsulating material.

In the accompanying drawing Fig. 1 is a perspective view of one end of apoleline cross-arm provided with a set of insulators constructed inaccordance with my invention; Fig. 2 is a side elevational view of a.portion of the cross-arm shown in Fig. 1, showing one of the insulators;Fig. 3 is a plan view of the construction shown in Fig. 2; Fig. 4 is aplan view similar to Fig. 3 showing the lock portion of the insulatorwith the. key removed; Fig. 5 is an inverted plan view of the keyportion of the invertical sectional view taken centrally through theassembled insulator; and Fig. 7 is a transverse vertical sectional View,the section being taken substantially along the line 7-7, Fig. 2.

As shown in the drawing, my improved insulator consists of four parts, abase or lock portion 2, a key portion 3, a wire-holding pin 4, and alocking preferably tapered pin 5. The lock portion 2 may be composed ofglass or of any other suitable insulating material such, for example, asmolded material containing phenolic condensation products, or such othermaterial as may be found desirable. When the lock portion of theinsulator is made integral with the cross-arm, the entire cross-arm isconstructed of the insulating material selected. I have found that theinorganic insulating material-known as marvelite is well adapted forthis purpose.

The lock portion 2 of the insulator, when made as a separate article ofmanufacture as shown in the drawing, is of generally rectangular shapeand is provided on its upper side with a recess to receive the key 3.This recess has one end cut squarely into the body of the lock as shownat 6, while its other end is undercut as shown at 7. The overhangingledge formed by the undercut wall 7 of the recess is cut away insemicircular form as shown at 8 on Fig. 4 and directly beneath thiscut-away portion is an opening which receives the pin 4. This pin has aflange or shoulder 10 at its upper edge 1 which forms a seat for thewire'll. The wire enters the look through an opening 12 formed adjacentto the undercut wall 7, passes around the pin 4, and is brought outthrough another opening 12 on the opposite side of the lock.

The key 3 is so shaped as to conform to the recesses formed in the lookas described above. It consists of a body portion 15 having a projection16 which fits within the semi-circular recess 8 in the lock and the bodyportion 15 is cut away as shown at 17 to fit over the pin 4 and thecurved part of the wire'11. The upper portion 19 of the key is roundedand extends beyond the body portion 15 on all sides, forming a flange 20which covers the joints between the lock and the key and serves to keepout moisture. The lock and the k'eylare provided with matched grooves 21which together form a seat to receive the locking pin 5.

Each insulator may be placed on top of the cross-arm 21 or in a recesscut in the top of the cross-arm, and is fastened in position by means oflag-screws 22 which extend through the lock portion 2 and into thecross-arm.

The locks 2 are secured to the cross-arm before the cross-arm is placedin position on the pole. When the wires are to be attached, the linemancrimps the wire with a suitable tool to produce a semi-circular loop,and places the loop in position with its ends extending through theopenings 12, inserts the pin 4, places the key in the lock, and finallysecures the key in position by inserting the pin 5. It will be observedthat the lineman is not required to fasten the wires in place by meansof tie-wires as in the ordinary pole-line insulators and that theassembly of eachinsulator is made quickly and permanently.

If desired, the pin 5 may be made in the form of a bolt, in which casethe lineman completes the assembly by screwing a nut on the end of thebolt. As a further precaution against removal of the key, the key andthe lock may be provided, as shown in Fig. 6, with openings to receive alag screw 23. This screw, however, is not necessary since the lock andthe key are held firmly together by means of the pin 5.

It is to be understood that the details of construction which I haveherein shown and described may be modified in various respects withoutdeparting from my invention and I therefore desire that no limitationsbe imposed upon my invention except such as are indicated in theappended claims.

I claim as my invention:

1. A pole-line insulator comprising a lock member provided with a recesshaving one squarely cut end and one beveled end, and provided also withan opening communicating with said recess, a wire-engaging pin receivedin said opening, a key member shaped to fit within the said recess andover the said pin, and a locking pin received in registering grooves inthe said lock and key members.

2. A pole-line insulator comprising a lock member provided with a recesshaving one squarely cut end and one undercut beveled end, and providedalso with an opening at the undercut beveled end of said recess, awire-engaging pin receivedin said opening, a key member shaped to fitwithin said recess and over the said pin, and a locking pin received inregistering grooves in the said lock and key members.

3. A pole-line insulator comprising a lock member having a recessextending from side to side thereof, the said recess having one squarelycut end and one undercut beveled end, a pin received in an openingformed in said lock member, said pin extending into said recess, a keymember shaped to fit within said recess and over said pin, the saidmembers being provided with openings cooperating to define a channel forreceiving a loop of wire adjacent to the said pin, and a locking pinreceived in matched grooves formed in said lock and key members.

4. A pole-line insulator comprising a lock member of generallyrectangular form having a recess extending across its upper face, saidrecess having one squarely cut end and one undercut beveled end, andhaving a semi-circular recess at the said beveled end of the saidfirst-named recess, a pin received in an opening in said lock memberbeneath said semi-circular recess, said pin being provided with a flangeat its upper end, and the said lock member being provided withwirereceiving openings adjacent to said pin, a key member shaped to fitwithin said recesses in said lock and over said pin, said key memberhaving a curved wall cooperating with said wire-receiving openings andsaid flange to define a channel for receiving a loop of Wire, the saidkey member being provided with an overhanging or roof flange, and alocking pin received in registering grooves formed in said lock and keymembers at the said squarely cut end of said first-named recess.

In testimony whereof, I, the said ALBERT F. EMMoNs have hereunto set myhand.

ALBERT F. EMMONS.

lVitnesses:

R. D. BROWN, J. R. KELLER.

